Function rustc_middle::ty::layout::fn_abi_of_instance

fn fn_abi_of_instance<'tcx>(
    tcx: TyCtxt<'tcx>, 
    query: ParamEnvAnd<'tcx, (Instance<'tcx>, &'tcx List<Ty<'tcx>>)>
) -> Result<&'tcx FnAbi<'tcx, Ty<'tcx>>, FnAbiError<'tcx>>